JPS6436352A - Memory error processing system - Google Patents

Abstract

PURPOSE:To segment a software error from a hardware error and to obtain convenience in a maintenance operation, by deciding whether one bit error is the software error or the hardware error from contents held by an error address register, a syndrome register, and a write flag register. CONSTITUTION:In a CPU or a diagnosis processor, the output of the syndrome register 7, the error address register 8, and a write flag circuit 10 are registered after being checked. And when the one bit error is generated, and when the one bit error is registered again in spite of setting the one bit error in the write flag register 10, it is possible to decide the one bit error as the one due to a defective memory device, thereby, it can be separated from the software error. Because the software error of a memory device is recovered by a write instruction at the time of setting the write flag register 59 if it is the software error, and hereafter, no original one bit error is regenerated unless the one bit error is generated newly. In such a way, the decision of a card objected to be exchanged can be easily facilitated in a following maintenance operation.